Spamfilter Policy for Reseller

First of all, want to say, that ISPConfig3 is a fantastic and easy control panel. But thats not why i'm here. And sorry for the bad english.

Ive got a reseller, that wants to adjust his own spamfilter policy. I've got the default spam policy and i'm very happy of it. The reseller wants to have its own. But how can i give the reseller the option to make his own spamfilter? I cannot add the policy option to the reseller. I cant find it. Is it an option thats not implemented? Or am i looking at the wrong side?